Opinions On Head Gaskets

Well.....the power part I know is splittin hairs. Even puttin this together with just copper coat and NO gasket would still be under 8:1 I believe. LOL Even still, I want a .020 gasket if I can find one. I have the Mr Gasket ones on order.....but who knows when or if they'll come in.

What I don't get is, there are dead soft copper head gaskets that are thicker that people use. What's the difference other than thickness? I've seen people use them without o-rings too. I'm not arguing.....I'm probably not going to use them.....just doesn't feel right.......I;m just kinda thinkin out loud.
OK I get that you want a super thin head gasket to boost compression.
I ask, why not mill the heads and use a real gasket?